الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Optical networks have been paid attention in the last 20 years due to the big growth in communication networks generally and the Internet especially. The huge growth in Internet users and services made the development to be very vital and necessary. Optical networks are considered to be the magical solution to face the excessive amount of information needed to be transferred through the Internet because optical fibers have large bandwidth, low noise, low bit error rate and very small power loss. The bottle neck of optical networks is Optical-Electrical-Optical conversion (OEO) that may limit the bandwidth and the data transmission rate. In order to avoid this problem, all optical networks were proposed such that data is transmitted in the form of light from ingress node to egress node without any conversion to the electrical form in between. Several models were proposed to achieve this mission like optical circuit switching (OCS), optical burst switching (OBS) and optical packet switching (OPS).
In this thesis, we propose a detailed analysis of optical burst switched (OBS) networks. We developed four different models to evaluate the blocking probability of Just In Time with No-Wavelength Conversion (JIT-NWC), Just In Time with Limited Range Wavelength Conversion (JIT-LRWC), Just Enough Time with Void Filling (JET-VF) and Just Enough Time with No-Void Filling (JET-NVF), respectively. We depended on the theory of Markov chain to find product form analytical solution of complex stochastic problems. The comparison between JIT and JET has shown that the first outperforms the latter but JET requires very complex regulations and steps to achieve this high performance. In order to find practical and implemental solution, we proposed JIT-LRWC that proved to give low blocking probability and lower expenses than JET.